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Eye movements in heterophoria.

L D Pickwell

    The British Journal of Physiological Optics
    |January 1, 1976
    PubMed
    Summary

    Versional recovery movements during the cover test are observed in heterophoria, supporting Hering

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    Area of Science:

    • Ophthalmology and Vision Science
    • Neuroscience
    • Ocular Motor Control

    Background:

    • Previous research by the author documented versional recovery eye movements during the cover test in the non-occluded eye of individuals with heterophoria.
    • These observations initially supported Hering's Law of Equal Innervation, although the magnitude of the movement did not correlate with the degree of heterophoria.

    Purpose of the Study:

    • To investigate the presence and characteristics of versional recovery movements during the cover test in relation to heterophoria.
    • To explore factors influencing the occurrence of these movements, particularly in cases of small heterophorias.

    Main Methods:

    • Observation of eye movements during the cover test in patients with heterophoria.
    • Analysis of versional recovery movements in the non-occluded eye.
    • Correlation analysis between movement magnitude and degree of heterophoria.

    Main Results:

    • Versional recovery movements were observed, supporting Hering's Law.
    • The magnitude of these movements did not consistently relate to the degree of heterophoria.
    • Recent studies suggest a threshold for these movements in very small heterophorias, influenced by phoria size, ocular motor dominance, and patient concentration.

    Conclusions:

    • Versional recovery movements during the cover test are a documented phenomenon in heterophoria, consistent with Hering's Law.
    • The absence of these movements in very small heterophorias indicates a potential threshold.
    • Factors such as phoria size, ocular motor dominance, and patient concentration significantly influence the presence of these recovery movements.

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